Hey guys, I tried using Jami, but I can’t get it to work. I have two Android phones—on two different ISPs—both set up with the default configurations. I scan the QR codes and add the contacts, but they turn orange and stay orange. Messages aren’t coming through. I switch the default from push to DHT: nothing. I add the DHT proxy: nothing. I try on the same Wi-Fi network: nothing (neither push, nor DHT, nor DHT with proxy). I try a whole series of combinations, nothing… But how do I do it? 
Check for IPv4 or IPv6, and then try turning off the DHT proxy and TURN
Won’t it work if mobile network does provide its service via IPv4 protocol only?
While the both of the Android devices are connected to the same Wi-Fi network and the “Connectivity mode” is set to “Local DHT node” then OK, both of devices see each other online (the green indicator is on for each).
But when they are connected to the mobile 5G the indicator lights go orange and even switching the “Connectivity mode” to “UnifiedPush” gives no result. The turning off the DHT proxy, the TURN (together or separately by turn) do not affect the situation either.
Either you have IPv4 that can be used for P2P, or you have IPv6 available. I remember that 5G networks all provide IPv6